What derives from what?

Sir we used to believe derivatives derived from the market but each day that passes, with articles such as "Derivatives law sheds light on the financial ripple effect" Aline van Duyn, August 29, we suspect that it could equally be that it is the market that derives from derivatives.

This reminds me of what I have always felt about the issue of immigration and securing the borders, namely that whenever you build a wall you cannot be absolutely sure you end up on the right side of it.